Hi all,
This series implements the Permission Overlay Extension introduced in 2022
VMSA enhancements [1]. It is based on v6.11-rc4.
Changes since v4[2]:
- Added Acks and R-bs, thanks!
- KVM:
- Move POR_EL{0,1} handling inside TCR_EL2 blocks
- Add visibility functions for registers [4]
- Make ID_AA64MMFR3_EL1 writable
- use system_supports_poe() more consistently
- use BIT instead of hex constants
- fix off-by-one in arch_max_pkey() macro
- add PKEY_DISABLE_EXECUTE and PKEY_DISABLE_READ
- Update some comments and commit messages.
- No change to when we save/restore POR_EL0 for signals!
Conflicts with GCS:
- Uses the same (last) bit in HWCAP2
- Uses the same VM_HIGH_ARCH_5
Conflicts with arm64 KVM:
- Maz has taken patch 8 into one of his own series
- I have taken and modified a patch from Maz (patch 9)
The Permission Overlay Extension allows to constrain permissions on memory
regions. This can be used from userspace (EL0) without a system call or TLB
invalidation.
POE is used to implement the Memory Protection Keys [3] Linux syscall.
The first few patches add the basic framework, then the PKEYS interface is
implemented, and then the selftests are made to work on arm64.
I have tested the modified protection_keys test on x86_64, but not PPC.
I haven't build tested the x86/ppc arch changes.
Thanks,
Joey
[1] https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/arm-a-profile-architecture-2022
[2] https://lore.kernel.org/linux-arm-kernel/20240503130147.1154804-1-joey.gouly@xxxxxxx/
[3] Documentation/core-api/protection-keys.rst
[4] https://lore.kernel.org/linux-arm-kernel/20240806-kvm-arm64-get-reg-list-v2-0-1d3fbc7b6844@xxxxxxxxxx/
Joey Gouly (30):
powerpc/mm: add ARCH_PKEY_BITS to Kconfig
x86/mm: add ARCH_PKEY_BITS to Kconfig
mm: use ARCH_PKEY_BITS to define VM_PKEY_BITN
arm64: disable trapping of POR_EL0 to EL2
arm64: cpufeature: add Permission Overlay Extension cpucap
arm64: context switch POR_EL0 register
KVM: arm64: Save/restore POE registers
KVM: arm64: make kvm_at() take an OP_AT_*
KVM: arm64: use `at s1e1a` for POE
KVM: arm64: Sanitise ID_AA64MMFR3_EL1
arm64: enable the Permission Overlay Extension for EL0
arm64: re-order MTE VM_ flags
arm64: add POIndex defines
arm64: convert protection key into vm_flags and pgprot values
arm64: mask out POIndex when modifying a PTE
arm64: handle PKEY/POE faults
arm64: add pte_access_permitted_no_overlay()
arm64: implement PKEYS support
arm64: add POE signal support
arm64/ptrace: add support for FEAT_POE
arm64: enable POE and PIE to coexist
arm64: enable PKEY support for CPUs with S1POE
arm64: add Permission Overlay Extension Kconfig
kselftest/arm64: move get_header()
selftests: mm: move fpregs printing
selftests: mm: make protection_keys test work on arm64
kselftest/arm64: add HWCAP test for FEAT_S1POE
kselftest/arm64: parse POE_MAGIC in a signal frame
kselftest/arm64: Add test case for POR_EL0 signal frame records
KVM: selftests: get-reg-list: add Permission Overlay registers
Documentation/arch/arm64/elf_hwcaps.rst | 2 +
arch/arm64/Kconfig | 23 +++
arch/arm64/include/asm/cpufeature.h | 6 +
arch/arm64/include/asm/el2_setup.h | 10 +-
arch/arm64/include/asm/hwcap.h | 1 +
arch/arm64/include/asm/kvm_asm.h | 3 +-
arch/arm64/include/asm/kvm_host.h | 4 +
arch/arm64/include/asm/mman.h | 10 +-
arch/arm64/include/asm/mmu.h | 1 +
arch/arm64/include/asm/mmu_context.h | 46 +++++-
arch/arm64/include/asm/pgtable-hwdef.h | 10 ++
arch/arm64/include/asm/pgtable-prot.h | 8 +-
arch/arm64/include/asm/pgtable.h | 34 ++++-
arch/arm64/include/asm/pkeys.h | 108 ++++++++++++++
arch/arm64/include/asm/por.h | 33 +++++
arch/arm64/include/asm/processor.h | 1 +
arch/arm64/include/asm/sysreg.h | 3 +
arch/arm64/include/asm/traps.h | 1 +
arch/arm64/include/asm/vncr_mapping.h | 1 +
arch/arm64/include/uapi/asm/hwcap.h | 1 +
arch/arm64/include/uapi/asm/mman.h | 9 ++
arch/arm64/include/uapi/asm/sigcontext.h | 7 +
arch/arm64/kernel/cpufeature.c | 23 +++
arch/arm64/kernel/cpuinfo.c | 1 +
arch/arm64/kernel/process.c | 28 ++++
arch/arm64/kernel/ptrace.c | 46 ++++++
arch/arm64/kernel/signal.c | 62 ++++++++
arch/arm64/kernel/traps.c | 6 +
arch/arm64/kvm/hyp/include/hyp/fault.h | 5 +-
arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 27 ++++
arch/arm64/kvm/sys_regs.c | 25 +++-
arch/arm64/mm/fault.c | 55 ++++++-
arch/arm64/mm/mmap.c | 11 ++
arch/arm64/mm/mmu.c | 45 ++++++
arch/arm64/tools/cpucaps | 1 +
arch/powerpc/Kconfig | 4 +
arch/x86/Kconfig | 4 +
fs/proc/task_mmu.c | 2 +
include/linux/mm.h | 20 ++-
include/uapi/linux/elf.h | 1 +
tools/testing/selftests/arm64/abi/hwcap.c | 14 ++
.../testing/selftests/arm64/signal/.gitignore | 1 +
.../arm64/signal/testcases/poe_siginfo.c | 86 +++++++++++
.../arm64/signal/testcases/testcases.c | 27 +---
.../arm64/signal/testcases/testcases.h | 28 +++-
.../selftests/kvm/aarch64/get-reg-list.c | 14 ++
tools/testing/selftests/mm/Makefile | 2 +-
tools/testing/selftests/mm/pkey-arm64.h | 139 ++++++++++++++++++
tools/testing/selftests/mm/pkey-helpers.h | 8 +
tools/testing/selftests/mm/pkey-powerpc.h | 3 +
tools/testing/selftests/mm/pkey-x86.h | 4 +
tools/testing/selftests/mm/protection_keys.c | 109 ++++++++++++--
52 files changed, 1060 insertions(+), 63 deletions(-)
create mode 100644 arch/arm64/include/asm/pkeys.h
create mode 100644 arch/arm64/include/asm/por.h
create mode 100644 tools/testing/selftests/arm64/signal/testcases/poe_siginfo.c
create mode 100644 tools/testing/selftests/mm/pkey-arm64.h
--
2.25.1
